<!-- 添加商品页面 -->
<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert
        title="添加商品信息"
        type="info"
        show-icon
        :closable="false"
        center>
      </el-alert>
      <!-- 步骤条区域 -->
      <el-steps :active="active - 0" finish-status="success"  align-center :space="200">
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- 表单验证 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
      <!-- tabs标签条 -->
      <el-tabs :tab-position="'left'" v-model="active" :before-leave="beforeTabLeave" @tab-click="tabClick">
        <el-tab-pane label="基本信息" name="0">
          <el-form-item label="商品名称" prop="goods_name">
            <el-input v-model="addForm.goods_name"></el-input>
          </el-form-item>
          <el-form-item label="商品价格" prop="goods_price">
            <el-input v-model="addForm.goods_price" type="number"></el-input>
          </el-form-item>
          <el-form-item label="商品重量" prop="goods_weight">
            <el-input v-model="addForm.goods_weight" type="number"></el-input>
          </el-form-item>
          <el-form-item label="商品数量" prop="goods_number">
            <el-input v-model="addForm.goods_number" type="number"></el-input>
          </el-form-item>
          <el-form-item label="商品分类" prop="goods_cat">
            <el-cascader
              v-model="addForm.goods_cat"
              :options="catesList"
              :props="cateProps"
              @change="handleChange">
            </el-cascader>
          </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品参数" name="1">
          <!-- 渲染表单的item项 -->
          <el-form-item :label="item.attr_name" v-for="item in manyTabData" :key="item.attr_id">
            <el-checkbox-group v-model="item.attr_vals">
            <el-checkbox :label="item1" v-for="(item1, index1) in item.attr_vals" :key="index1" border></el-checkbox>
            </el-checkbox-group>
          </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品属性" name="2">
          <el-form-item :label="item2.attr_name" v-for="item2 in onlyTabData" :key="item2.attr_id">
            <el-input v-model="item2.attr_vals"></el-input>
          </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品图片" name="3">
          <!-- action 表示图片要上传到的后台API地址
               :on-preview 表示图片点击后的预览效果
               :on-remove 表示图片移除的点击事件
               list-type 表示图片展现方式，这里使用的是缩略图形式 -->
          <el-upload
            :action="uploadURL"
            :on-preview="handlePreview"
            :on-remove="handleRemove"
            :headers="headerObj"
            :on-success="handleSuccess"
            list-type="picture">
            <el-button size="small" type="primary">点击上传</el-button>
          </el-upload>
        </el-tab-pane>
        <el-tab-pane label="商品内容" name="4">
          <!-- 富文本编辑器 -->
          <quill-editor v-model="addForm.goods_introduce" />
          <!-- 添加商品按钮 -->
          <el-button type="primary" class="btn" @click="add">添加商品</el-button>
        </el-tab-pane>
      </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览对话框 -->
    <el-dialog
      title="图片预览"
      :visible.sync="previewVisible"
      width="50%">
      <img class="im" :src="previewPath">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'

export default {
  name: 'Add',
  components: {},
  data () {
    return {
      active: '0',
      // 添加商品的数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [],
        pics: [],
        goods_introduce: '',
        attrs: []
      },
      addFormRules: {
        goods_name: [
          {
            required: 'true',
            message: '请输入商品名称',
            trigger: 'blur'
          }
        ],
        goods_price: [
          {
            required: 'true',
            message: '请输入商品价格',
            trigger: 'blur'
          }
        ],
        goods_weight: [
          {
            required: 'true',
            message: '请输入商品重量',
            trigger: 'blur'
          }
        ],
        goods_number: [
          {
            required: 'true',
            message: '请输入商品数量',
            trigger: 'blur'
          }
        ],
        goods_cat: [
          {
            required: 'true',
            message: '请选择商品分类',
            trigger: 'blur'
          }
        ]
      },
      // 商品分类列表
      catesList: [],
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children',
        expandTrigger: 'hover'
      },
      // 动态参数列表
      manyTabData: [],
      // 静态属性列表
      onlyTabData: [],
      uploadURL: 'https://www.liulongbin.top:8888/api/private/v1/upload',
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath: '',
      previewVisible: false
    }
  },
  methods: {
    async getCatesList () {
      const { data: res } = await this.$http.get('categories')
      // console.log(res.data)
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类列表失败！')
      }
      this.catesList = res.data
    },
    handleChange () {
      console.log(this.addForm.goods_cat)
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave (activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类！')
        return false
      }
    },
    async tabClick () {
      // 要想获取商品参数是在触发第二个tab时发生的，即active = 1
      // 此时需要请求商品参数的数据
      if (this.active === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'many' }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数失败！')
        }
        console.log(res.data)
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTabData = res.data
      } else if (this.active === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'only' }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性失败！')
        }
        this.onlyTabData = res.data
        console.log(this.onlyTabData)
      }
    },
    handleSuccess (response) {
      // 1.拼接得到一个图片对象
      const picInfo = {
        pics: response.data.tmp_path
      }
      // 2.将对象push到pics中
      this.addForm.pics.push(picInfo)
      console.log(this.addForm)
    },
    handlePreview (file) {
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    handleRemove (file) {
      // console.log(file)
      // 1.获取将要删除的图片临时路径
      const filePath = file.response.data.tmp_path
      // 2.找到pics中对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 3.调用数组的splice方法，把该对象移除
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm)
    },
    // 添加商品预验证
    add () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请先填写必要的表单项！')
        }
        // 执行业务逻辑
        // lodash 中的_cloneDeep方法可以深拷贝一个对象，因为直接把addForm重新赋值会报错
        // 获取商品参数时需要的goods_cat是数组，而提交表单验证时需要传的参数中，goods_cat是以','分割的分类列表
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数和静态属性
        this.manyTabData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        this.onlyTabData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        console.log(form)
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败！')
        }
        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      })
    }
  },
  created () {
    this.getCatesList()
  },
  computed: {
    // 获取动态参数的第三级id
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  },
  watch: {},
  mounted () {

  }
}
</script>
<style lang="less" scoped>
  .el-checkbox{
    margin: 0 10px 0 0 !important;
  }
  .im{
    width: 100%;
  }
  .btn{
    margin: 15px 0;
  }
</style>
